Join Date: Jan 2006
Location: Northern California
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Given by your last post I'm guessing you've identified the plastic bushing on some parts website, because yes the diagram picture doesnt include it.
I havent had to replace the bushing in mine since my truck is still low mileage, but its a common wear item for high mileage CAD axles due to the counter rotation of the shafts in 2wd. And probably the lack of maintenance most front axles receive...
As for the diaphragm, I dont have a positive answer for you other than I would think you're correct in that there should be no leak in the diaphragm. The vacuum system is closed so if there's any leak then its going to cause the vacuum pump to pull air and possibly reduce the vacuum level across the system. The CAD diaphragm should be sealed whereby allowing full vacuum to pull the collar full movement in both directions and hold it there. That would make the most sense.
'01 2500 Sport 4x4 5spd w/Fastcoolers, Mag-Hytec, EZ, RV275's, 4" w/o muffler, South Bend, Steering brace, aFe, 2 lo kit, Isspro Boost, FP, and EGT on pillar, Westach Trans/Diff temp gauge in dash pod, Raptor 100 w/ 1/2" line, Pac Brake, Rancho 9000, 285's